*{margin: 0; padding: 0;}
html,body{
    height: 100%;
}
.web{
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    overflow: hidden;
}
.web video{
    width: 100%;
    position: absolute;
    left: -999px;
    right: -999px;
    top:-999px;
    bottom:-999px;
    margin:auto;
}
.poster{
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    left: 0;
    top: 0;
    z-index: 10;
    -webkit-transition: all 300ms ease-in;
    transition: all 300ms ease-in;
}
.poster img{
    position: absolute;
    left: -999px;
    right: -999px;
    top:-999px;
    bottom:-999px;
    height: 100%;
    margin:auto;
}
.loading{
    display: none;
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    left: 0;
    top: 0;
    z-index: 20;
    -webkit-transition: all 300ms ease-in;
    transition: all 300ms ease-in;
}
.loading img{
    position: absolute;
    left: -999px;
    right: -999px;
    top:-999px;
    bottom:-999px;
    margin:auto;
}